STEREO DEMODULATION CIRCUIT

STEREO DEMODULATION CIRCUIT

PURPOSE:To eliminate the DC variation of stereo demodulation output which is generated at detuning due to the variation of the DC output potential of an FM wave detector, by applying the output of a composite input amplifier to an operational amplifier via an LPF and a resistance. CONSTITUTION:The o...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser: KAKIHARA EISHIN
Format: Patent
Sprache:eng
Schlagworte:
BROADCAST COMMUNICATION
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION
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Beschreibung
Zusammenfassung:PURPOSE:To eliminate the DC variation of stereo demodulation output which is generated at detuning due to the variation of the DC output potential of an FM wave detector, by applying the output of a composite input amplifier to an operational amplifier via an LPF and a resistance. CONSTITUTION:The output of a composite input amplifier A1 is applied to operational amplifiers A2 and A3 respectively via an LPF containing a resistance R19 and a capacitor C1 and then resistances R8, R9, R17 and R18 respectively. An input terminal for output signal of an FM wave detector is shown by ''1'', and an input terminal for reference DC voltage is shown by ''2'', and input terminals for switching signal of 38kHz which have phases opposite to each other are shown by ''3'' and ''4''.